GROLEMUND, G.; WICKHAM, H. . Dates and Times Made Easy with lubridate. Journal of Statistical Software, [S. l.], v. 40, n. 3, p. 1–25, 2011. DOI: 10.18637/jss.v040.i03. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v040i03. Acesso em: 10 aug. 2022.